/Engine/Source/Runtime/Engine/Classes/Animation/AnimInstance.h
Same as Montage_Stop. Uses values from the AlphaBlendArgs. Other settings come from the montage asset
void Montage_StopWithBlendOut ( const [FAlphaBlendArgs](API\Runtime\Engine\FAlphaBlendArgs) & BlendOut, const [UAnimMontage](API\Runtime\Engine\Animation\UAnimMontage) * Montage )